Preparation of bismuth substituted yttrium iron garnet powder and thin film by the metal-organic decomposition method

✍ Scribed by Hanju Lee; Youngwoon Yoon; Songhui Kim; Hyung Keun Yoo; Harutyun Melikyan; Emma Danielyan; Arsen Babajanyan; Takayuki Ishibashi; Barry Friedman; Kiejin Lee

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 915 KB
• Volume: 329
• Category: Article
• ISSN: 0022-0248
• DOI: 10.1016/j.jcrysgro.2011.06.048

✦ Synopsis

The crystallization of bismuth substituted yttrium iron garnet (Bi-YIG) powder and thin film prepared by the metal-organic decomposition method (MOD) have been studied. In the powder analysis, it was observed that the pyrolysis of metal-organic compounds begins at 250 1C and completed at 450 1C from the thermo-gravimetric-differential thermal analysis experiment. The crystallization temperature of Bi-YIG powder was 900 1C, and at lower temperature, secondary YFeO 3 , g-Fe 2 O 3 , a-Fe 2 O 3 , and BiFeO 3 phases were observed by X-ray diffraction and Fourier transform infrared spectroscope. This crystallization temperature is higher than other chemical solution decomposition methods, so we suggest that the formation of BiFeO 3 in the MOD method increases the crystallization temperature. In the thin film analysis, the crystallization temperature for Bi-YIG is 750 1C, and at lower temperature, secondary phases are observed by X-ray diffraction. It is observed that high pre-annealing temperature promotes the crystallization of secondary phases. From the magneto-optical measurement, it was observed that the secondary phases strongly degrade the magneto-optical properties of the Bi-YIG thin film.